Stop using old createLayerTreeViewForTesting.

Use the new method without a parameter and remove the old deprecated
one.

R=dglazkov@chromium.org, dglazkov

Review URL: https://codereview.chromium.org/289863010

git-svn-id: svn://svn.chromium.org/blink/trunk@174579 bbb929c8-8fbe-4397-9dbb-9b2b20218538